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'''Clayton Class 17 D8568''' is the only surviving example of the Clayton Type 1s which numbered 117 in total. The locomotive is based at Intended by British Railways as the Chinnor & Princes Risborough Railway and is used during standard Type 1 for the running season and at special eventsrailway system, supplanting the EE type 1 (later class 20), poor reliability meant withdrawals began as early as 1968, when some members were just four years old. It is owned by Although the [[Diesel Traction Group]]. It Class was allocated a [[Diesel Locomotives hired by the SVRTOPS codes|hired by the SVRTOPS code]] from May to September 2017 and has also attended a number , none of [[Diesel Locomotives visiting the SVR locomotives survived long enough for galas|Diesel galas]]renumbering.

== D8568 in BR service ==Intended by British Railways as the standard Type 1 for All but two of the railway system, supplanting the EE type 1 (later class 20), poor reliability meant withdrawals began as early as 1968, when some members were just four years old. Although the Class was allocated a [[TOPS codes|TOPS code]], none fitted with pairs of the locomotives survived long enough 450hp Paxman 6ZHXL 6-cylinder horizontal engines designed for renumbering(but never used in) in railcars. Three variations of the class were built:

The Class was equipped for multiple working with 'Red Diamond' (Class 17/3: 'Blue Star') locomotives. Although D8568 is the unique survivor one of each sub-class 17/1 (8521) and 17/3 (8598) survived into BR Departmental service at Derby Research Centre until 1978.<ref>[https://www.railuk.info/diesel/getclass.php?id=69 Railuk.info] (Retrieved 4 August 2019)</ref>.

[[File: D8568_20150930.jpg|thumb|300px|right|D8568 passing Highley, September 2015]]Purchased by the DTG it left Clitheroe on 9 February 1983 for the North Yorkshire Moors Railway, returning to traffic 22 April 1989. On 25 April 1992 it arrived at its present moved to a new home on the Chinnor and Princes Risborough Railway. As it is owned by the Diesel Traction Group, which has other locomotives based on the SVR, it was a visitor for [[Diesel Locomotives visiting the SVR for galas|galas]], first in 1998 and several times from 2015 with extended stays. During such visits it was sometimes referred to as a 'home fleet' locomotive in publicity. It was [[Diesel Locomotives hired by the SVR|hired in]] between May and September 2017. D8568 also visited for repairs, and from 2020 to 2022 underwent a repaint into BR blue livery, bodywork attention and work on the Paxman engines,<ref>[https://www.svrlive.com/blsep20 Branch Lines newsletter, September 2020] (Retrieved 29 August 2020)</ref> before returning to Chinnor to complete its agreed running dates. The loco is now based at the SVR<ref>SVR Operations Manager, 15 March 2023</ref>.

As it is owned by the Diesel Traction Group, which has other locomotives based on the SVR, it has been a visitor for [[Diesel Locomotives visiting the SVR for galas<gallery mode=packed heights=200px style="text-align:left">D8568_20150930.jpg|galas]]D8568 passing Highley, first in 1998 and several times from September 2015D8568_20210813. It also may visit for repairsjpg|D8568 repainted in BR blue livery, and arrived in January 2020 for just such work. August 2021</gallery>